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f2fs: return error when accessing insane flie offset 

If file offset is insane, we have to return error instead of kernel panic.

Reported-by: Eric Zhang <followme999@163.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2017-08-21 13:51:32 -07:00
parent 0adf6a1b79
commit adb6dc1971
1 changed files with 5 additions and 1 deletions
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6
fs/f2fs/node.c
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@ -555,7 +555,7 @@ static int get_node_path(struct inode *inode, long block,
level = 3;
goto got;
} else {
BUG();
return -E2BIG;
}
got:
return level;
@ -579,6 +579,8 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
int err = 0;
level = get_node_path(dn->inode, index, offset, noffset);
if (level < 0)
return level;
nids[0] = dn->inode->i_ino;
npage[0] = dn->inode_page;
@ -878,6 +880,8 @@ int truncate_inode_blocks(struct inode *inode, pgoff_t from)
trace_f2fs_truncate_inode_blocks_enter(inode, from);
level = get_node_path(inode, from, offset, noffset);
if (level < 0)
return level;
page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(page)) {